/Engine/Source/Runtime/Core/Public/Async/TaskGraphInterfaces.h
When a task completes, fire a scoped event
void TriggerEventWhenTaskCompletes ( [FEvent](API\Runtime\Core\HAL\FEvent) * InEvent, const FGraphEventRef & Task, [ENamedThreads::Type](API\Runtime\Core\Async\ENamedThreads__Type) CurrentThreadIfKnown, [ENamedThreads::Type](API\Runtime\Core\Async\ENamedThreads__Type) TriggerThread )